[CMake] problem with add_custom_command / add_custom_target in different directories

[Philip Lowman]

I'm trying to come up with a way to have a custom target defined in the
top-level directory execute a collection of custom commands previously
defined in subdirectories throughout the code (to untar many tarballs).
Unfortunately, the approach I'm trying isn't working.

When I invoke add_custom_target() immediately after add_custom_command() in
the same directory, it works fine.  When I invoke add_custom_target() in the
parent directory it causes an error in the makefiles.

I've attached a small example of the problem I'm having.  Not sure if this
is a bug or just user error.

lowman at locke:~/tmp/cmake_tests/CustomCommandProb/build$ make untar
Scanning dependencies of target untar
make[3]: *** No rule to make target `../foo-1.2.3', needed by
`CMakeFiles/untar'.  Stop.
make[2]: *** [CMakeFiles/untar.dir/all] Error 2
make[1]: *** [CMakeFiles/untar.dir/rule] Error 2
make: *** [untar] Error 2

-- 
Philip Lowman
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